Please list an example of a physical change and an example of a chemical change.
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A physical change refers to a change in a substance's physical properties, such as its shape, size, or state of matter, without altering its chemical composition. Here's an example of a physical change:
Example: Melting ice cubes - When ice cubes are heated, they change from a solid state (ice) to a liquid state (water), but their chemical composition remains the same.
On the other hand, a chemical change, also known as a chemical reaction, involves a change in a substance's chemical composition to form new substances with different properties. Here's an example of a chemical change:
Example: Rusting of iron - When iron is exposed to oxygen and moisture, it undergoes a chemical reaction to form iron oxide (rust), which is a different substance with different properties compared to iron.
To determine whether a change is physical or chemical, you can observe if there is a change in the chemical composition of the substance. If the chemical composition remains the same, it is a physical change, whereas if there is a change in chemical composition, it is a chemical change.